Rock-drill



(No Model.)

J. F. ALLEN.

ROGK DRILL. No. 266,668. Patented Oct. 31, 1882.

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N. PEYERS, Phuwumu n bar a NITE STATES JOHN F. ALLEN, OF BROOKLYN, NEW YORK.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 266,668, dated October 31, 1882.

Application filed February 8, 1882. (No model.)

To all whom it'may concern:

Be it known that I, JOHN F. ALLEN, a citizen of the United States, residing at Brooklyn, Kings county, and State of New York, have invented a new and useful Improvement in tock-Drills, of which the following is a specification.

The nature of my invention consists in the combination of a rotary engine direct with the feedingscrew of the rock-drill, operated at the required time by the pressure acting upon the piston, for the purpose of turning said feeding-screw when required to move the rockdrill downward.

In the accompanying drawings, Figure I represents a rock-drill with my improvement attached. Fig. IIis avertical section, and Fig. III a horizontal section, of a rotary engine adapted for that purpose.

Similar letters represent similar partsin all the figures.

A represents a rock-drill; (J, the frame, on which the rock-drill is made to move upward or downward; and G, the feeding-screw for moving the rock-drill attached to the frame 0, and working in a suitable nut attached to the lug II and the cylinder, arranged and constructed in the usual manner.

E isa rotary engine, attached to the lower end of the rock-drill cylinder A. To the shaft or spindle J of the rotary engine a tube, F, is attached, inclosing. the feeding-screw G, and provided with a key or feather, b, at its upper end, working in acorresponding groove or keyway, 0, made the whole length in the feedingscrew G. By this connection any motion of the rotary engine will act upon the feedingscrew G direct without any intermediate gearing to turn the same, and thus move the rock-drill in the usual manner. By means of the usual handle, K, thesame can be turned by hand in the usual manner. In the lower part of the rock-drill cylinder an opening, a,is provided, connected, through pipe :0, with the rotary engine, to admit the pressure from the rock-drill cylinder into the rotary engine to operate the same when required. The upper part of the piston -rod D of the rock-drill is recessed at d, of such proportion and length in relation to the opening a, above mentioned,

that the lower edge, a, of said recess (Z will uncover this opening a to admit the pressure from the rock-drill cylinderAinto the rotary engine E only after the drilling-tool has penetrated the drill-hole the desired depth, and the rock-drill requires to be moved farther downward, while before the drilling-tool has penetrated to that depth the surface of the pistonrod D will cover the opening a, and thus prevent the admission of the pressure into the rotary engine.

It will readily beunderstood that the rotary engine may be connected with the feedingserew G by any other mechanical device arranged to turn said screw, and likewise that the rotary engine may be attached to the upper end of the frame 0 and attached to the upper end of the feeding-screw Gr. The passage for the admission of the pressure mustin that case be connected with the passage a by means of a flexible or expanding pipe, 00; but I prefer the arrangement above described.

The rotary engine which I have arranged and intend to apply to the feeding-screw, although I do not claim this construction,as any similar and other rotary engine will answer the purpose, is represented in Figs. II and III, where E is the case of the engine, into which a hollow cylinder, N, is fixed eccentric to form the crescent-shaped chamber M. To the center of the cylinder N the shaft or spindle J is fastened, passing through one end of the case E, and is connected to the feeding-screw G to operate the same, for the purpose described. On a stationary pin, .2, concentric with the center of the case E, three disks, P P P, are hinged, fitting tight all around in the cavity M of the case, and passing through the walls of the hollow cylinder N, through circular packingpieces 20. m is the inlet for the pressure, connected through pipe (I) with the passage a in the rock-drill cylinder A, as above described, and m is the outlet or escape passage. This outlet-passage m may be connected with the pipe conducting the pressure to the drillingcylinder by the arrangement of suitable valves or cocks, and the passage m arranged to be changed in that case for the escape of the pressure, whereby the action of rotary engine will be reversed, and the feeding-screw G operated to move the rock-drill upward by means 2. In combination with the feeding-screw G to of this rotary engine, instead of by the handof a rock-drill, a rotary engine,E, in combinawheel K. tion with the passage to and recess 11, arranged What I claim as my invention, and desire to to operate substantially as described. 5 secure by Letters Patent, is-- I H F ALLEN 1. In a rock-drill, the combination of a r0- tary engine with the feeding-screw, connected Witnesses: Without intermediate gearing, substantially in HENRY E. ROEDER, the manner and for the purpose specified. J. B. NONES. 

